He absolutely will in a location that is not the shop! James once gave him a taste of his own medicine and he very much did not like that. How dare?
Cue him just looking at Sam, dumbfounded at first because he's being offered food, and then mildly offended that that's what Sam eats? Does James not pay him enough??
Please, do not give him opportunities to preen. He'll definitely get a kick out of this and purposefully mix things up. Just to see if Sam will correct him, smiling all the while. It's adorable, really.